By bessie m



F. C. GREEN, DECD.

s. M. GREEN. ADMlNlSTRATRiX.

ELECTRICAL APPARATUS.

APPLICATION FILED mac. 4, I9l6.,

1,326,049; Patented Dec. 23,1919.

W WW

Attorn eg.

I UNITED sTArns PATENT OFFICE.

FRANK C. GREEN, DECEASED, LATE 0F PITTSFIELD, MASSACHUSETTS, BY BESSIE M. GREEN, ADMINISTRATRIX, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR T0 GEN- EBAL ELEQTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL APPARATUS.

Specification of Letters Patent.

Application filed December. 4, 1916. Serial-No. 135,098.

To all whom it may concern:

Be it known that FRANK C. GREEN, de ceased, late a citizen of the United States, and a resident of Pittsfield, in the county of Berkshire. State of Massachusetts, during his lifetime invented certain new and useful Improvements in Electrical Apparatus; and that I, Bnssm M. GREEN, duly appointed administratrix of the said FRANK C. GREEN,

do hereby declare, to the best of my knowledge and belief, that the following specification, taken in connection with accompanying drawings, is a clear, true, and complete dey scription of said improvements.

- the casing, the casing is usually closed and provided with a vent which communicates with the atmosphere, so'that the space in the casing above the oil is filled with air. Now this practice, though almost universally followed prior to this invention, has been regarded as objectionable on several grounds:

' moisture from the atmosphere may be absorbed by strength of the oil reduced, a solid substance sludge, so called) may be thrown down by the action of the air on the 011, an explosive mixture may be formed by the air and oil vapors within the tank (and ignited by any are in the tank).

by the oil.

One embodiment of this invention is shown in the accompanying drawing, to

which reference may be made for a complete understanding of the same.

Referring now to the single figure of the device being submerged ,the oil and hence the dielectric.

drawing, which isa vertical section through a the device, partially in elevation, 10 is a casing rovided with a cover 11, which is shown as orming a. substantially air tight joint with the top of the remainder of the casing. For this purpose a gasket 12 is placed between the flattened peripheral ortion of the cover and the top of the main body of the casing, the parts being held together b bolts 13. Thecasing is partially filled with oil 14 within which is submerged an electrical device such as a transformer 15, the

space within the casing above the oil bein indicated by the reference numeral 16.

Patented Dec. 23, 1919.

v In accordance with this invention, the

space 16 is filled with an inert gas, such ascarbon dioxid, and in the embodiment here illustrated, this gas is introduced to the space from a. gasometer 17 The asometer is provided with the usual expansi le cham-.

,ber 18, which is partially inclosed by the vertically movable cylinder or drum 19, the latter being sealed by a liquid 20 which is preferably also an oil in order that no moisture may be introduced to the casing inclosing the electrical device from this source. The expansible chamber of the gasometer may be filled with an inert gas by attaching a suitable receptacle such as a,

tube of compressed carbon dioxid to a pipe 21,0penin into .the chamber 18. The expansible c amber of the gasometer communicates with the space 16 in the casinglO by means of a pipe 22 in which is interposed a drying device 23 which is shown as comprising a casing 24 provided with a plurality of perforated disks 25, on which a suitable drier 26, such as calcium chlorid, is placed. When the cover 11 of the casing is formed with strengthening ribs .27, it is necessary to provide openings 28 in the uppermost portion of the ribs adjacent the cover, in order that air may not be pocketed between the ribs.

In order initially to get the apparatus in condition for operation, the casing may be municating pipe is connected to the casing and the oil in the casing then lowered away to leave the usual space above the oil, which will be filled with the inert gas as the oil is lowered.- In operation, the movable cylinder of the gasometer is so counterweighted that the gas in the top of the cylinder will be under a slight pressure, for example about two-tenths of an ounce. In this manner the'inert gas from the gasometer will take the place of any sligheescape that may occur in the casing or housing of the electrical ,device. .At. thesame, time, it will be apparent that the expansion chamber provides for the usual expansion and contraction of the oil due to changes of temperature. '=While carbon dioxid is mentioned as a suitable inert gas forthe purposes of this invention, it will be understood that any other inert gas, such as nitrogen, or an inert gas diluted with an amount of air insufficient to form an explosive mixture, may be used.

-" It will be understood, therefore, that when an inert gas is referred to in'the claims, the mean ngis to include any gas that does not form an exploswe mixture wlth the vapors from the oil or which is otherwise suitableas herein-indicated.

1-111 accordance with the provisions of the patent statutes, the. principle of operationof invention is'described', together withthe apparatus which is now considered to represent" the best embodiment thereof; but it is to-be understood'that the apparatus shown is o'nly' illustrative, and that the-invention can be carried out by other means.

What-is claimed as new'and desired to securef, by"Letters Patent of the United .1. In an electric apparatus, the combination witha substantially air tight oil filled casing, of an electric. apparatus submerged within the oil,.a gasometer, of the constant pressure type fi1led withan inert gas, and a communication between the portion of tion with a substantially air tight oil filled casing, of an electrical apparatus submerged Within the oil, a. gasometer of the constant pressure type filled with an inert gas, and a communicating connection between the portion of said casing above the oil level and said 3 gasometer said' connection being provided with a gas filtering device for removing oil adulterating ingredients from said gas.

4. In an electrical ap aratus, the combinationwith a substantial y airtightoil filled easing, of an electrical apparatus-submerged 1 within the oil, a gasometer comprising telescoplng containers filled with an. ineltgas under constant pressure, and a communion,-

ing connection between the port-ion 'o' fsaid casing above the oil level and said gasont eter; said connection being-provided with a gas. filterin' .and drying'device having a plurality o perforatedpartitions carrying drying and filtering reagents through which the gas is arranged to. pass when'traversing said connection.

In witness iwhereof, I my handthis l4:tll "d3.y of Nov.,,"1916.

I "BESSIE: My -GREEN, Administratrim Greemdeceased.

have hereunto set fwtlw 'e'state I Frank i l 

